Remote MCP Server On Cloudflare 22f

🚀 Deploying a Remote MCP Server on Cloudflare

Let's set up a remote MCP server running on Cloudflare Workers and integrate OAuth login functionality!

🚀 Quick Start

💻 Local Development

# Clone the repository
git clone git@github.com:cloudflare/ai.git

# Install dependencies
cd ai
npm install

# Run locally
npx nx dev remote-mcp-server

You should be able to open a browser window at http://localhost:8787/ for access.

🔗 Connecting the MCP Inspector to Your Server

To explore the new MCP API, you can use the MCP Inspector.

• Start it using npx @modelcontextprotocol/inspector.
• In the inspector, switch the transport type to SSE, enter http://localhost:8787/sse in the URL, and click "Connect".
• You'll enter a (simulated) user/password login page. Enter any email and password to log in.
• You should be redirected back to the MCP inspector, and you can now list and call any defined tools!

🔗 Connecting Claude Desktop to the Local MCP Server

The MCP inspector is great, but what we really want to do is connect it to Claude! Follow the Anthropic's Quick Start Guide, go to "Settings" > "Developer" > "Edit Configuration" in Claude Desktop to find your configuration file. Open the file with a text editor and replace it with the following configuration:

{
  "mcpServers": {
    "math": {
      "command": "npx",
      "args": [
        "mcp-remote",
        "http://localhost:8787/sse"
      ]
    }
  }
}

This will run a local proxy that allows Claude to communicate with your MCP server via HTTP. When you open Claude, a browser window will open, allowing you to log in. You should see the available tools in the bottom right corner. As prompted, Claude may request to call the tool.

🚀 Deployment to Cloudflare

1. npx wrangler kv namespace create OAUTH_KV
2. Follow the guide to add the KV space ID to wrangler.jsonc.
3. npm run deploy

🔗 Calling Your Newly Deployed Remote MCP Server from a Remote MCP Client

Just as you did in the "Local Development" section, run the MCP inspector: npx @modelcontextprotocol/inspector@latest Then enter your Worker's workers.dev URL (e.g., worker-name.account-name.workers.dev/sse) in the inspector and click "Connect". You are now connected to your MCP server via the remote MCP client.

🔗 Connecting Claude Desktop to Your Remote MCP Server

Update the Claude configuration file to point to your workers.dev URL (e.g., https://worker-name.account-name.workers.dev/sse), and then restart Claude.

{
  "mcpServers": {
    "math": {
      "command": "npx",
      "args": [
        "mcp-remote",
        "https://worker-name.account-name.workers.dev/sse"
      ]
    }
  }
}

🐞 Debugging

If you encounter any issues, restarting Claude or directly connecting to your MCP server using the following command may help.

npx mcp-remote http://localhost:8787/sse

In rare cases, clearing the files in the ~/.mcp-auth directory may be helpful.

rm -rf ~/.mcp-auth